Home > Maintenance & Mods (L322) > Dual Battery Installation |
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4434Morrison Member Since: 02 Mar 2020 Location: Folkestone Posts: 185 |
Just completed a dual battery installation on my 2012 4.4 TDV8 VSE using the electrical harness supplied by:
Before placing the battery inside the cubby hole I had to move the main vehicle wiring harness from the floor of the cubby hole. That harness is held in place by plastic clips attached to screws that are firmly fitted to the floor of the cubby hole. To ensure that the screws did not work their way through the battery casing I removed the forward most of the two screws to create sufficient space for the battery to sit level on the floor and below the bottom of the plastic surround of the cubby hole. The vehicle wiring harness now goes around the side of the battery. The Quick release battery terminal clamps supplied with the wiring kit are too bulky and do not allow the plastic surround to clip into the rear retaining holes. I could have cut out the plastic surround but prefer to fit normal battery ternimal clamps in due course. These quick release battery clamps will have to be replaced (when I can get out to buy some) to allow the plastic cubby hole surround to fully clip into place. The battery and wiring harness now in place. Everything back together with the plastic tub from the cubby hole now in the recess, held in place by the side cargo net. 2015 E220 with AMG Sport Pack - Currently driven by my son 2010 3.6 TDV8 Vogue - Written off by my son |
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22nd May 2020 1:36pm |
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Tinman Member Since: 22 Mar 2017 Location: kent Posts: 1189 |
Nice easy job |
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22nd May 2020 2:46pm |
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DrRob Member Since: 16 Apr 2015 Location: Petersfield, Hampshire Posts: 4303 |
Is this so you have more juice to start it? Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
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22nd May 2020 2:57pm |
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wayneg Member Since: 05 Jun 2013 Location: South Fremantle, Australia ( ex London ) Posts: 798 |
What are you using the 2nd battery for? I would think the guage of wire is much to light to carry any significant load. The loom can be easily lifted up and out of the battery area and run above the fuse box, it is now very vunrable if the battery moves as its not secured down.. A much more heavy duty instal can be made with a metre of decent cable and a voltage sensing relay capable of handling the current.
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22nd May 2020 3:14pm |
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Joe90 Member Since: 29 Apr 2010 Location: Hampshire Posts: 6409 |
voltage sensing relay rated at 100A .
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22nd May 2020 3:25pm |
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4434Morrison Member Since: 02 Mar 2020 Location: Folkestone Posts: 185 |
@Joe90,
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22nd May 2020 3:43pm |
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Alistair Member Since: 11 Feb 2011 Location: Peterborough / Bordeaux / Andorra Posts: 7937 |
It's not voltage sensing - it's switched via the ignition
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22nd May 2020 4:23pm |
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Joe90 Member Since: 29 Apr 2010 Location: Hampshire Posts: 6409 |
You have two things: the "voltage sensing relay" (as Alistair says) which clicks in when the ignition comes on, and a 100 amp fuse on the main cable to the battery to prevent catastrophe .
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22nd May 2020 5:24pm |
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Alistair Member Since: 11 Feb 2011 Location: Peterborough / Bordeaux / Andorra Posts: 7937 |
Almost..... the relay isn't a true voltage sensing one - its triggered by the ignition - that's the independent connection that goes to the mini fuse - when that terminal gets power of roughly 12v it triggers the relay making a connection across the 2 main terminals
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22nd May 2020 5:40pm |
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GGDR Member Since: 26 Nov 2016 Location: London Posts: 3545 |
A VSR isn't expensive. Nor a 100a fuse.
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22nd May 2020 5:58pm |
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Alistair Member Since: 11 Feb 2011 Location: Peterborough / Bordeaux / Andorra Posts: 7937 |
There's a fuse in the kit linked in the original post - but not visible in the pictures |
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22nd May 2020 6:10pm |
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Alistair Member Since: 11 Feb 2011 Location: Peterborough / Bordeaux / Andorra Posts: 7937 |
VSR - depends on what you want. If it's sole purpose is to boost starting capacity, then you don't want a VSR - as it will actively prevent the second battery helping if the main battery is below 12.7v....... |
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22nd May 2020 6:15pm |
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wayneg Member Since: 05 Jun 2013 Location: South Fremantle, Australia ( ex London ) Posts: 798 |
The thin wires on the install in question would surely melt under starting load if the cranking battery was flat? I doubt very much that the relay from that kit is anything more than a standard 12v relay rated at 100a, it's just switched via ignition and not by voltage increase.
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23rd May 2020 1:07am |
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4434Morrison Member Since: 02 Mar 2020 Location: Folkestone Posts: 185 |
Many thanks for everyone's knowledgeable input on the dual battery system that I installed.
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23rd May 2020 3:57am |
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